Approximately 2 weeks after filing Form I-130, Petition for Alien Relative, USCIS will mail you a receipt letter that confirms receipt of your petition. Be sure to file a complete and properly prepared petition. If your petition is incomplete, USCIS will reject it or ask you for more evidence or information. This delays processing and causes confusion in the process. For a detailed time line, read What Happens After Filing Form I-130 Petition.
USCIS will notify you when they make a decision. Petitions with long wait times may not be approved immediately. For an explanation, read After I-130 is Approved, What's Next.